Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e6e57760ab669f81d0a19145876801d6905d251ed6000a3df38b36b9cd69a4' 
  AND token = 'QhIeKbISJ437qJOtAYL5gGEgT0JLspX5r2i20AwOSQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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