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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16f0854b4dfcd1d4148ab6f5cc1fcd55e95367c1b38b0ff65b4838cd1c7f926e' 
  AND token = '2rXyV36scFUA2WpNTSaECbJ+uUE9Dw2i+/ZwfuGkJ74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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