SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0695432a97beb9e682e7136cac15348dfffa65e2d005b4b5af56690eb9973d' 
  AND token = 'bJIQDNztOLZBF5MH+4GAfjvV8Z/W4K876FOw/YCOeGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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