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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94924cdcd9bdc416aebe8b7043c18b93d436c562f9ae7cdb2eaed4649e3a5c8f' 
  AND token = 'oyCbV1SPPZvjenpxt/X0qXqEEnfxFVApzy5GD5YlkcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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