SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d0c0a1354bee3e849dfce3f65ec5cc69307287787d552540018ca4bb6bd1d9' 
  AND token = 'MdO4rVmq/aBWl/A4wtnAYqDWAjWRv/z7gBX6Iu7KfAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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