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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ae8cc020382c3d8229192b5fc62088bc72ec0df839d8a03947caf8d2ad06fd' 
  AND token = '/tnwe7yxqqPjqFmuGYISgZUfl+Xd0xEEQLWfBAsxOfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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