SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae7e89070d626616c3a143a213ff39b645bb08f5bb9d31c7f3fe39e6e0071ff' 
  AND token = 'u4JqYOlrK2+Y2f/KAaRnFybJ/izLqnFzOuvHITLLW6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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