SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e5b6c520b9cc4bf990d3bef8f13b9cfd41f7f225ff074651286bf91d93843f' 
  AND token = '6PETwXcRrAJ+KGdjZ/ItJ42rIsdqhUOKMILaJRIWFD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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