UPDATE 
  cscart_lock_keys 
SET 
  expiry_at = UNIX_TIMESTAMP(NOW()) + 30, 
  token = 'WRQgr621L2FudrNc9x1fVB6/nrEn7S0+Y3fvtMYDOFc=' 
WHERE 
  key_id = '634e44367bbd419387d210c4f169d1af6fba40fbf5978be379cadc1368215231' 
  AND (
    token = 'WRQgr621L2FudrNc9x1fVB6/nrEn7S0+Y3fvtMYDOFc=' 
    OR expiry_at <= UNIX_TIMESTAMP(NOW())
  )