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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb80c94d2d2d8fc03aa13802e497ad62f45659fdd0df6a9d82169f2d99318d74' 
  AND token = 'ra4B7xYHv/QM7RgCMwktq5092MM+1BmsY2IgqELfdJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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