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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c93b8d0dba059bbb4c8a20a45daa71a81cd697d244fae1b8a1ee4b1a396ff59' 
  AND token = 'AXHaPE6Hyuta9mFAP5/VzNygQT0KkeqkH8WOVgzygNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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