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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9435d698f08c0a99bbfa8a1ba71baf8bd2ac772639058ddf00bf5fcb1c6f6c5b' 
  AND token = 'NWGmqw4l41JXCn+3/8MQM+e5JT7tolKp5T8JCxcMEpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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