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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e663db0004fdf6f8501e99ade59e26f7e105e693f33141d8bb319557c49f2890' 
  AND token = 'ZQufI/hVO2RryOdIBHfWdrwWF572GFLY/o/Sba5FsLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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