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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b780a4c0c9b74bbaebb6df9ebbaafc13de7f09b5c1e589dc649985157194fb05' 
  AND token = 'Jxdux9J9AmbKFWTI8YrlPBxZqoBtLvBBZCjM3zbZbd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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