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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5769e9e0888e16405c2b199748480b653d41194e64ddfb0a6384069d79aa95' 
  AND token = '6gQOhX7PVlWjMiO4htt/7zpIhMrdvI9njd0zE7KQa6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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