SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd301f8b0777a3c5fd6cf800d39722ecfc32264b15b50b5bff7840ec45a9eb1' 
  AND token = 'qjCYn3PjIgCJvG0b3qsSJgCKlziZTNKSIrHQ4jkPdTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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