$_mod_isset = $pdo->getArray('UserRescon', array(), array(
    'select' => array(
      'UserRescon' => 'id, user_id, mod_name',
    ),
    'where' => array(
      'UserRescon.mod_name'   => $mod,
      // 'UserRescon.user_id'    => $user_id,
    ),
    'limit' => [10], 
  )
);

0.0000231: xPDO query object created 0.0000501: Added selection of UserRescon: `id`, `user_id`, `mod_name` 0.0000660: Added where condition: UserRescon.mod_name=finance 0.0000401: Sorted by UserRescon.id, ASC 0.0000010: Limited to 1, offset 0 0.0002961: SQL prepared "SELECT `UserRescon`.`id`, `UserRescon`.`user_id`, `UserRescon`.`mod_name` FROM `modx_user_rescon` AS `UserRescon` WHERE `UserRescon`.`mod_name` = 'finance' ORDER BY UserRescon.id ASC LIMIT 1 " 0.0001550: SQL executed 0.0000200: Total rows: 1 0.0000160: Rows are fetched 0.0018189: Total time 2 097 152: Memory usage Array ( [id] => 1 [user_id] => 3 [mod_name] => finance )