Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd3159566f5fb859687e4a9dfe04d431c43771f704618e8b190df28b5f30018' 
  AND token = 'fl39ePpeRpMloDDqXfWiLNEK/BtqqyDJtPolh6DCA/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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