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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc4d1652993d3e2181a8f55bc0a03eab4f66bd80102b5f2703ac42e639b7290f' 
  AND token = 'NSy2UwRHLkmFrUKaUx7foHJ7Qxl5LaYrG5/deQXm16w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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