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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d776e35a7496f6b7a502c5ffeae7c79f2348eafff825c5e770afe5eae31e212' 
  AND token = 'Oc4mrwmONvB3E4HaC7e/jIQII6NnlOvvxfZi5u67q2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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