SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2133302f0128816bf8e1f680971df821807b6fca25332bb84ceeb20177dfb4af' 
  AND token = 'phGScwTg5DQPMB4PusWg5yEyvISiWGNJ3OE3pJeC7nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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