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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1283224997e6674969890cfadc31924d085bd722f4ff8b726d60bf70c2bf7e0f' 
  AND token = 'RAo5fp2ommIfQOCviwCYc7mqhMqSFRs1m4gfIGM/Kv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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