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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d56c252ccb7629e4c0d150812ac01d155288df31ad2dc26682836cf540f756' 
  AND token = 'XN0nDF4Eyh73gbAXxXruxqzclHYNmq2bjGJeEyfq9mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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