Example of a cached query

cached-query.php

<?php 

$cache_key = '%cache_key%';
$query = get_transient( $cache_key );

if ( ! $query ) {

	$query = new WP_Query( array(
		'post_type'      => 'post',
		'post_status'    => 'publish',
		'posts_per_page' => 12,
		'order'          => 'ASC',
		'orderby'        => 'title menu_order',
	) );

    	set_transient( $cache_key, $query, 3600 ); // Expires in 1 hour (60 seconds * 60 minutes)

}