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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb36366993383ec8b7a1eedaacc214cd9080d47b47c80079bbc2522afeb2f42' 
  AND token = 'Ii/DmZONVo+OJyQLrT75A0h/sI2BKMmCOl95muNi1Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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