SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8001a3f4299f9e0b84f9169e8a2a9704f80b613da5f756a680c6d1e94863c72' 
  AND token = 'Cot7TXgZGUjNLQ8nx7TVj4O3U6pcHh2V+BoTywwugM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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