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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f9b722e85ea2e2b83236e3559f871beaf8f483a06b3046ee4deb89fef3ea94' 
  AND token = '6DPPSrDaQ8kzvY6Ms9V1fD3juxPUuoUsDuAiwE4HcKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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