SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea0cfb526e557f3519a9a8d358fdc190a36fb2ffd6f54b8e9558bbc0e9d0070' 
  AND token = 'ezh6+Iaa4S/BtxOZwKkcxy6widrCeKWVupv13jlhJJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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