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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d566eb0b8f696295e55e5da692d3745007c347d2528ca557517c95056bd2b8' 
  AND token = 'UEg8ciy1ArNOHWbpCp1QMPJhafqfF6JlV7v9vqCA9rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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