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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd6b98b8202646966d37f977fc745d1e84c760bca676501ed3fac7430d7e50f' 
  AND token = 'IBX8QCurl4sR3zlQltNIWmx0xjYsfWDNW1b8FQl1cVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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