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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab73434efc110cbc62ee060bbd033189960399144ce4d1f303ffa331a3f50c8d' 
  AND token = 'kRemfmhyXT8nY71et/Dc7ZejeJdIc4oAZyunUzL6k0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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