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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0de8f61cd02d31afdce67f2a7bd02f7b353a2a9bcdedc48f785d4bc4263742' 
  AND token = 'TukWSKNw2WftXGpKbo0Oi3mI6rPN5qHXQWoDhvM+9mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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