Commerce: remove old LOCKED carts

Commerce has functionality to remove old carts. But locked carts can't be removed. This code fixed this

/**
* Implements hook_query_TAG_alter().
*/
function MYMODULE_query_commerce_cart_expiration_alter(AlterableInterface $query) {
 // Remove old locked carts.
 $conditions = &$query->conditions();
 foreach ($conditions as $key => $condition) {
   if (isset($condition['field']) && $condition['field'] === 'commerce_order.locked') {
     unset($conditions[$key]);
     break;
   }
 }
}