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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5279d9dd8d8d7b00d1e58e923182717ed8624a20b3048a01d3984288394350' 
  AND token = '6WySu04LKrnCucJouj9OwZQz1eV/8YfUQ9+vl56zZBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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