SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1f99f49d06df311ec94630e3dd170259068217ef5397a359208dcce99c8ca7b' 
  AND token = '/IWBlQ+q9YTlP1Z+8DJGD28InqVrK6isQIZ40zPDb6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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