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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97bba5848fae08ed8e7cb5b84070d5b59d10055eac141b8881c4076a355ea846' 
  AND token = 'ADEeON42/uctynjEBkedv2jHuJigZFbRtFt6G+C/MQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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