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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b4310add120dbc3cbbd0d5f27118aef7abc12316069f23605438547eb862a7' 
  AND token = 'DRkyLqm6gq575Mui7/Wij0H06lv3npoUhFs8+Zbpm90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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