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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d624f005d9979eb84a931e37f03d73d0951faf1e1ba8863a825d6d3d481d771' 
  AND token = '6aRT1I7h5PKUbXlRqxb8qsL3aC57fGSbmy/vK5wC+Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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