SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632fc129ea8d861eb238e9dc118621271bb728eb77c914fe6abc5e0af56bb40e' 
  AND token = 'll0JiDI/Rv+iW3rgSg5fENS4GwZupsPzTNlhKDGjhuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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