Mysql database query very slow with huge data / rows using CREATE INDEX in PHP

CREATE INDEX visitorhistory_store_created_at_index ON visitorhistory (store, created_at);

The reference use: https://blog.nodeswat.com/making-slow-queries-fast-with-composite-indexes-in-mysql-eb452a8d6e46

How to add/update multiple products in cart in shopify

jQuery(function () {
   
jQuery('body').find(".couponproduct .gf_add-to-cart").click(function (e) {
e.preventDefault();
values = {}
                values[30370850865245] = 0;
                values[31289364840541] = 1;
                jQuery.ajax({
                      type: 'POST',
                      url: '/cart/update.js',
                      data: { updates: values},
                      dataType: 'json',
                      success: function() {
                        location.href = '/checkout';
                     }
               });
});
   
});

Create simple popup using HTML CSS

HTML

<div class="main-chaty-popup-bg"></div>
<div class="main-chaty-popup">
      <div class="main-chaty-box">
              <h4>Chaty is currently off</h4>
              <div class="popup-content">
                       <div class="popup-content-wrapper"> Chaty is currently turned off, would you like to save and show it on your site? </div>
              </div>
              <div class="popup-content-footer">
                      <button type="button" class="btn btn-primary">Yes, Show it on my site</button>
                      <button type="button" class="btn btn-default">Just save and keep it off</button>
              </div>
              <div class="modul-close-btn">
                       <a href="#"> X </a>
              </div>
        </div>
 </div>

CSS

<style type="text/css">
    .main-chaty-popup-bg {position: fixed;left: 0;top: 0;width: 100%;height: 100%;overflow: auto;background-color: #000; opacity: 0.5;z-index: 111;}
    .main-chaty-popup {margin:0;width: 100%;text-align: center;z-index: 1;}
    .main-chaty-box {margin: auto; padding: 0px; width: 660px; height: 170px; background: #FFF; position: fixed; top: 0; right: 0; left: 0; bottom: 0;z-index: 999;}
    .main-chaty-box h4 {background: #FCFCFC; margin: 0;padding: 10px 0 10px 10px;font-size: 22px;color: #626262;line-height: 22px;text-align: left;border-bottom: 1px solid #e5e5e5;}
    .modul-close-btn {position: absolute; right: 18px; top: 20px; transform: translate(50%, -50%); background: linear-gradient(0deg, #333, #333), linear-gradient(153.18deg, #6371DB 7.07%, #FF89C4 90.47%); border-radius: 50%; width: 22px; height: 22px; display: flex; align-items: center;justify-content: center;padding: 0; border: 0; z-index: 1; box-shadow: 0 4px 14px rgba(0, 0, 0, .15); cursor: pointer;}
    .popup-content-footer{position: absolute;bottom: 0; width: 100%; padding: 10px 0;border-top: 1px solid #e5e5e5;}
    .popup-content-footer .btn-primary{background:#00C67C;border: none;padding: 10px;color: #FFF;cursor: pointer;box-shadow: 1px 1px 2px 1px #000;border-radius: 5px;margin-right: 15px;}   
    .popup-content-footer .btn-default{background:#F7F7F7;border: none;padding: 10px;color: #655d5d;cursor: pointer;box-shadow: 1px 1px 2px 1px #000;border-radius: 5px;}
   .popup-content-wrapper{margin-top: 25px;}
 </style>