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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff0bd31716f8be38160addea5b203b100a8a00e2bf8c6b0b2d600a8ccbe8d19' 
  AND token = 'poJOHy8iNLzaSBeHqvBqpRzn29T3LU1qK4MEaiTxbEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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