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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d29c20a9412b164f1caa420a8e5cc4502a1c44ae07f3d027664762a4cfe562' 
  AND token = 't/QxWIRr4+jYYZDrzuHGaa7wXhlIZaUqYRMNq74v9cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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