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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee03e8e7c34ebe4a4bbde36b8ff1891b1dd40bb1f01b7156e9e4be054742933' 
  AND token = 'Wacc60oruH42FVxNedTZOnLU2hyaUOIJ8tZCZOydbOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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