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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b3353ebfe437f7fc35ac9858ae432806d304024fae3b418455c1d5a369bf2d' 
  AND token = 'DpLCtZJoEVFEAw2U1ZdPHnv1xe/P3u9zeyKY0f77yjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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