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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '901a39f574c7b2fb46a9212adb1e69d2db392043d48eb54d81966f13e2f3b736' 
  AND token = 'xdBFfrSE3vHIykfEaxsk2KKbFuxnFhVhL8X6epe2uo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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