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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873e0c023d037495cfe15b7432db68ff1cb9ed8446dbe3eb3728d90d53f8a7e6' 
  AND token = 'cMEDMl+KqEttVkQkDA9NaWN1sgqhBxs/eS0Mw6kmZek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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