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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '253da4fc71fe64366824ba252efee04a6cd43c2fdff190553b685ab18b3781d4' 
  AND token = '9h7mbFJLPoiQA2/Rdd1RKUWYMM3/oUq8iujrEbOdvW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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