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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e6c475f6ef433efb8cb2572aa12318f9c347d8f24303612252886a69386a6d' 
  AND token = 'Bd6oZIFPKv/faGKlAZZEz2DWH2/SxTkB0Nq2BWW5sCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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