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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b502eb2022bf35b20510159f9c638529696d92d7aab2c43516dc0915d7f685' 
  AND token = 'hsyFFBIUhgqYu0yOcVeURnYM9W047ldz3BEwnqSSsAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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