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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb8c80662dcd64fabefd0dae94f1e61c21fc3ec395658022a5887436667fbba' 
  AND token = 'zNr39tYy7W8Q6Q7ohtrIgWltdS3EAdNkCdGCmjGdG7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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