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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc0bd790f012383a25240b419f2f9a43a57273311f2571b220326e0cd89be60' 
  AND token = 'LKWC3y/dS/h1i9fx90DBASjEpXO+Wqf6HC4+v2HJc+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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