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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a927c5d5e7780dfc3d9a30e192097ebfde864226589bc076e26b6a2c34974aff' 
  AND token = '8qqX5713sZe3zSllXTGMya3wlXIEv6rhiK2ow/DQ6U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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