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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056441c676776467580014c2bb925294a211b89ae89f6f1f4427148476177f30' 
  AND token = '/Nr3tA7WGjUYjffDfx6v/4hTimRVFf5udEfcECB/vB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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