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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828bd386c7a641294460c0599d0f4df93fce51f94ddd49861b4ccf90cfdec8ce' 
  AND token = 'ACegDAMQfg+92qEZfI79pi+vAZcbDupl/9S2Y2AO9Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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