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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c50634d02ecdf4f78f8a2f3c8f30e42f816c7477b3be32e1f73cf3963eb9f49a' 
  AND token = 'SCFhJkVrVWm4gbwtaIFLEG/gU/0MQr7T/7M6hEmzyak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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