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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f61a10449768d89bff21abe81505cf68ca4b31a19ebfcc8dc9a61fffb1070f' 
  AND token = 'QUBFNI0GP5dPuuzh5q7OU7g7RvHmmeTgeT5sYBIn/Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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