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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95aa0319aa74daa8e46648625dfd2b5051c54f90c42f6c64ac4b27bdd33a15c' 
  AND token = 'Mnbgm7CYCzVJ5ALbumYuupj3kgrLJpEqfKpq7oIC36k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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