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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ca477089da51c23cca7fe72f95a8893af4ccfc6a0cb9c66812b06a979b901f' 
  AND token = '2wg0mebc/LnmG3SFfcR2f76kZ9xNyChSg29KrrH1h2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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