SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '665fa6fbac3a8a444b297566ed030c3765942964bdecdb13cd315bf9c15cc73c' 
  AND token = 'wJj34tuuUQ7KVn6UKuFTkMGgpIXfIx797qB+ze7fl9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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