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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e9e038fed1f9f14d9d3ed1aaa040cb3394d264ecfc37ba26a08b8588a37a0b' 
  AND token = 'z3pZuE6bmmt02pYxOYsmP529UxWk0S4PqpsAjUCewJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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