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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '843e3b03060f4c3140dbeda582cb68166e9ca5088197b7ee33bb0f4fe6ecfab7' 
  AND token = '4oRg5m71uSp1G8y/yux0MHrOk1Ffud4zjfmtnwpN9DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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