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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c266b04ab065062f6ca6c3dd04ac19755a0c3fb73d9537b418ba710b3314214b' 
  AND token = 'y1upnL7qvoWnQTwkViGUeYE8HaXW+9QRGaDCx0BoTH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.58305

JSON explain

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