SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07cf1088af724cba814c438536f77977afe8c8215eb0b03f6f8dd31dafd96e62' 
  AND token = 'GlOBGIxkJJMxGQqvkMkZB+/rahrhDERgZpRZErlMY0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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