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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee65e38c2d6a03b65b7e5a3b116dcad1d5ff0b3a2ec5440d252c6c352ae74d3' 
  AND token = 'rgzyCzXipjXDKXjUCZNxR7dkccNXr5kypm8TY9Klj0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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