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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58774f86be6061f147a60f80d68c0a9b120224a4d79c4aa91518320fa6ab271f' 
  AND token = 'NpAMuK2qYyXo87831/2BDIiM8OSArPuBy8LPm9hJRGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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