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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a46042a8c72ca2b583ec89e517dfbf4ac16d6e617699e2cbc82ae10f07c307' 
  AND token = 'IA+VP8xaihGPZsdgauIozgk0vX7f59Csjrx+aRopCZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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