SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a16cb57818bf45de07de067b6352fa72fdb2d9bc90d838ea04c90b417d4f0b' 
  AND token = 'nszq/O4lnNVcBU3b+KaJh/R9ss9+IQAQU98IWccjXZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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