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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e82f49fcc28b4defcc4dcf9ad378c278f1b6d9d506f8d1dbdb9af00447451e' 
  AND token = 'OFioodTZtyTIPj6qV4nhjf5o0oY0l0N8B+gUGMb8mDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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