SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33660931d01ef4f4d36a13d47837b6cb584b83a8ee37b948ef8ff30614915980' 
  AND token = 'gwaRJ3ab+ENNLZjU1WLYrlz8LynTGCcZvmGZX2fuVms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}