SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c919337aaa299c888a39773b96b0590c712b0ebc1c6b81684765b1cd0aec724' 
  AND token = 'qKEQTMludC+Lo8/pZ5BIKLf0rkCoYzBZY4yGVwjszsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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