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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab7e1cc4e2ae79944fe7cce582d512674d5274e28ebfd7f9b9db7cb380a06ff' 
  AND token = '7+aTpsbGxOgchWozeIPo8hH/mTWpZB5au3tG5g5A4DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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