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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f0737370dcb18d854f1ae5d8f1662c297e9c53dd2a731536a9cdeaf6afb870' 
  AND token = 'eS8PF9iGcy7PVmUcHZqIMvHgkwtaoHq+Ovk0pP4kmn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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