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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db02bb6029d56a20f3d55e5f80fe3ac77db5669319cd005c94996564e0c4d794' 
  AND token = '7YEHEr60OG5FENF6wGP0eoV0Lm5GQxL/NKDYAzgiSaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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