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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa2a9d682886cf153fb4189a69d4af77daa4ba3f1f78969321e3d173fbdcad6' 
  AND token = 'OhGal8IAC1wWDTP0NloOIXRwUt+kdgZku8zVDVfqX8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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