SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c2839523113439dd93a626ad0f02508d3cd6277fda5ea72cdf2d436a507b47' 
  AND token = 'x9/VgtDTKuBtqWcJzvMZNsLcHNUaglZKIU+WfNoHtSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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