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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b673985185b20019f1ea269ec5d1e794d55192c56156b1cc960a4fd8d2962d0a' 
  AND token = 'ac+AQWBSS25uQz/G5+hYErq029QxW0ZyGtnuViR1mDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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