SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f731cf4f177c61a8ed47028918cb02e4f3620c8df3a289e950cbe6dbfd3446fd' 
  AND token = 'Jp8AFxJxz0CIFvMphaKACqt9FYXh9vi9XZs39hwqh8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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