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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa6fdc5b1e77bdbb8fa53c60cbd9f8b39723e5ff5e48a15f7f01c21b7a62cb8' 
  AND token = 'AK6VOOXxMS3ECZJL1wL1MmeJXKCjgO9Lyx5V6Oz4Hns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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