cpt_tsto

// WP_Query arguments
$args = array(
	'post_type'              => array( 'cpt_tsto' ),
	'post_status'            => array( 'publish' ),
	'nopaging'               => true,
	'meta_query'             => array(
		array(
			'key'     => '_tsto_event',
			'value'   => 'woocommerce_order_status_completed',
		),
	),
);

// The Query
$query = new WP_Query( $args );