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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10caf43d3b1fd9fc2f7e9466df5ca25751f1bafc24040e2cb8c4ada579592e2' 
  AND token = '/HNaMaK+u+bqdJx6bIE0JYdz4GRf1EET0p/vUPVysrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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