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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1255b3884d082425d81c93ca9a3e0898385b8e2cb07b016f0db370de5a19b4d8' 
  AND token = 'pc1W6CIG0M9TEOINTgAe2uhq7ohXDK8RaVTCFVcTuco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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